Military woman wanting a baby

Hey ladies so I'm active duty in the navy and my fiancé and I have been trying to have a little one of our own. Our lives are busy and heckteck. He's always in the mood to go at it and I'm not. I feel like no matter how many time or how much we do it that it won't happen. Dooooooo u guys think it's cuz the military lifestyle? Any advice to help?